After e, i, eu, l, or n, ch sounds a bit like the 'h' in English huge.
| ich bin | I am |
| freut mich | Pleased to meet you |
After a, au, o or u, ch is harder - more like the 'ch' in Scottish loch:
| auch | also |
| Buch | book |
sch sounds like English sh:
| schnell | fast |
| Flasche | bottle |
After a vowel, h is always silent, but it indicates the preceding vowel is long:
| Lehrer | teacher |